NO. 15 ARTHROPOD HOSTS OF HELMINTHS HALL 53 



An inspection of the tables indicates, first of all, that we have but 

 limited knowledge of the life histories of acanthocephalids in any- 

 one family, and that it will not be possible to generalize to any great 

 extent on such limited data. What may be said is as follows : 



NEOECHINORHYNCHIDAE 



In the Neoechinorhynchidae we know the life history of one 

 acanthocephalid, a parasite occurring in a large number of fish and 

 in some reptiles and amphibians, and the known intermediate hosts 

 are species of Siulis, one an unrecognized species, in the Neuroptera, 

 other hosts being leeches and snails. 



GIGANTORHYNCHIDAE 



In the Gigantorhynchidae we again have only one known life 

 history. In this case the echinorhynch occurs as an adult in mammals 

 of various groups, including primates, carnivores, and insectivores, 

 and has a species of Blaps, a coleopteron, as an intermediate host. 



OLIGACANTHORHYNCHIDAE 



In the Oligacanthorhynchidae we again have one acanthocephalid 

 with a known life history, the well-known thorn-headed worm of 

 swine, occurring in such animals as swine, carnivores, and man and 

 other primates. This worm has a number of species of scarabaeid 

 beetles as its intermediate hosts. 



CORYNOSOMIDAE 



In the Corynosomidae we have one know^n life history, that of an 

 acanthocephalid of water fowl, Anseriformes, using crustaceans, 

 amphipods and crayfish, as intermediate hosts. 



MONILIFORMIDAE 



In the Moniliformidae we have a parasite with a wide range of 

 primary hosts, from man, carnivores and rodents to rapacious birds, 

 and having as its intermediate hosts two si>ecies of Coleoi)tcra and two 

 of Orthoptera. 



ECHINORHYNCHIDAE 



In the Echinorhynchidae we have three acanthocephalids parasitic 

 in fish of numerous species, two of them with an amphipod as an 

 intermediate host and one with an aquatic isopod as an intermediate 

 host; and one acanthocephalid parasitic in various amphibians and 

 with an amphipod as its intermediate host. 



